CVE-2026-4926

Estado: ModificadaAlta (7.5)—
Impact:
A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.
Patches:
Fixed in version 8.4.0.
Workarounds:
Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.89%
Percentil entre todas las CVEs puntuadas: 58
Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1499.004 Application or System Exploitationimpact90 %
Vector CVSS con AV:N/AC:L/PR:N/UI:N indica explotación remota sin privilegios (T1190). CWE-400 y descripción de regex exponencial causan denegación de servicio por consumo de recursos (T1499.004).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing
Tecnologías afectadas (1)

Pillarjs — Path-to-regexp
CWE

CWE-400, CWE-1333
CWE-1333
Referencias

JSON original (NVD)

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      "value": "Impact:\n\nA bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.\n\nPatches:\n\nFixed in version 8.4.0.\n\nWorkarounds:\n\nLimit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns."
    },
    {
      "lang": "es",
      "value": "Impacto:\n\nSe genera una expresión regular defectuosa siempre que se tienen múltiples grupos opcionales secuenciales (sintaxis de llaves), como `{a}{b}{c}:z`. La expresión regular generada crece exponencialmente con el número de grupos, causando denegación de servicio.\n\nParches:\n\nCorregido en la versión 8.4.0.\n\nSoluciones alternativas:\n\nLimitar el número de grupos opcionales secuenciales en los patrones de ruta. Evitar pasar entradas controladas por el usuario como patrones de ruta."
    }
  ],
  "lastModified": "2026-09-09T13:20:25.320",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:pillarjs:path-to-regexp:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DB421812-F7E3-4CC5-B02B-53CCBFDFB671",
              "versionEndExcluding": "8.4.0",
              "versionStartIncluding": "8.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb"
}